如果这是重复的问题,我很抱歉...我已经发布过了,但没有看到它实际上是否被发送到论坛中。
我一直在尝试让SlimDX DirectSound工作。这里是我的代码。它从一个wav文件填充辅助缓冲区,然后在一个线程循环中,交替地填充缓冲区的下半部分或上半部分。
它可以正常播放缓冲区的第一次加载。AutoResetEvents在应该时触发,然后填充了缓冲区的下半部分和上半部分(通过Debug语句进行验证)。但是,在缓冲区的第一次加载后,播放不会继续进行。所以,某种方式,缓冲区的重新填充没有按照预期工作。
有什么想法吗?
(我使用DirectSound是因为这是我找到的唯一设置要使用的音频设备的guid的方法。欢迎其他.NET友好的方法。)
private void PlaySound(Guid soundCardGuid, string audioFile) {
DirectSound ds = new DirectSound(soundCardGuid);
ds.SetCooperativeLevel(this.Handle, CooperativeLevel.Priority);
WaveFormat format = new WaveFormat();
format.BitsPerSample = 16;
format.BlockAlignment = 4;
format.Channels = 2;
format.FormatTag = WaveFormatTag.Pcm;
format.SamplesPerSecond = 44100;
format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlignment;
SoundBufferDescription desc = new SoundBufferDescription();
desc.Format = format;
desc.Flags = BufferFlags.GlobalFocus;
desc.SizeInBytes = 8 * format.AverageBytesPerSecond;
PrimarySoundBuffer pBuffer = new PrimarySoundBuffer(ds, desc);
SoundBufferDescription desc2 = new SoundBufferDescription();
desc2.Format = format;
desc2.Flags = BufferFlags.GlobalFocus | BufferFlags.ControlPositionNotify | BufferFlags.GetCurrentPosition2;
desc2.SizeInBytes = 8 * format.AverageBytesPerSecond;
SecondarySoundBuffer sBuffer1 = new SecondarySoundBuffer(ds, desc2);
NotificationPosition[] notifications = new NotificationPosition[2];
notifications[0].Offset = desc2.SizeInBytes / 2 + 1;
notifications[1].Offset = desc2.SizeInBytes - 1; ;
notifications[0].Event = new AutoResetEvent(false);
notifications[1].Event = new AutoResetEvent(false);
sBuffer1.SetNotificationPositions(notifications);
byte[] bytes1 = new byte[desc2.SizeInBytes / 2];
byte[] bytes2 = new byte[desc2.SizeInBytes];
Stream stream = File.Open(audioFile, FileMode.Open);
Thread fillBuffer = new Thread(() => {
int readNumber = 1;
int bytesRead;
bytesRead = stream.Read(bytes2, 0, desc2.SizeInBytes);
sBuffer1.Write<byte>(bytes2, 0, LockFlags.None);
sBuffer1.Play(0, PlayFlags.None);
while (true) {
if (bytesRead == 0) { break; }
notifications[0].Event.WaitOne();
bytesRead = stream.Read(bytes1, 0, bytes1.Length);
sBuffer1.Write<byte>(bytes1, 0, LockFlags.None);
if (bytesRead == 0) { break; }
notifications[1].Event.WaitOne();
bytesRead = stream.Read(bytes1, 0, bytes1.Length);
sBuffer1.Write<byte>(bytes1, desc2.SizeInBytes / 2, LockFlags.None);
}
stream.Close();
stream.Dispose();
});
fillBuffer.Start();
}
}